Rotation brush driving apparatus for vacuum cleaner

ABSTRACT

The present disclosure relates to a rotation brush driving apparatus for a vacuum cleaner capable of selectively transmitting power of a motor to a rotation brush in a simple structure. The rotation brush driving apparatus for a vacuum cleaner according to the present disclosure includes a motor for generating suction force; a rotation brush; a belt for transmitting rotation force of the motor to the rotation brush; and a driving selection unit installed rotatably around the rotation shaft of the motor, for selectively transmitting the rotation force of the motor to the rotation brush by selectively contacting the belt with the rotation shaft of the motor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 U.S.C. §119(a) from KoreanPatent Application No. 10-2006-0124981 filed Dec. 8, 2006, in the KoreanIntellectual Property Office, the disclosure of which is incorporatedherein by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosure relates to a vacuum cleaner, and moreparticularly, to a rotation brush for the vacuum cleaner.

2. Description of the Related Art

Generally, a vacuum cleaner is provided with a rotation brush forclearly removing dust attached to a surface to be cleaned such as acarpet and other surfaces. The rotation brush is rotated by forcetransmitted from a motor.

However, in a case that the rotation brush rotates in contact with abare floor, the rotation brush may damage the bare floor. In otherwords, the rotation brush increases a roughness of a smoothly processedsurface of the bare floor and decreases a gloss and a sense of beauty inexternal appearance.

It is therefore necessary to operate the rotation brush selectivelyaccording to user's intention so that the rotation brush is rotated in acase of cleaning a surface to be cleaned having much dust thereon suchas a carpet and the rotation brush is not rotated in a case of cleaninga smooth surface to be cleaned such as a bare floor.

FIG. 1 is a perspective view of a conventional upright vacuum cleanerwith a rotation brush.

Referring to FIG. 1, the upright vacuum cleaner 1 includes a cleanerbody 3 formed with a hand grip 2 at an upper side thereof, a suctionnozzle 5 placed at a lower end of the cleaner body 3 for drawing-inoutside air and dirt together and a traveling wheel 7 installed at alower side of the cleaner body 3 for moving the cleaner body 3 over thesurface.

Inside the cleaner body 3 is installed a dust collecting apparatus (notshown) for removing dirt from the air drawn-in through the suctionnozzle 5 and discharging cleaned air.

In addition, in front of the suction nozzle 5 is rotatably installed arotation brush 8 having a brush helically formed at an outside surfacethereof and, thus, capable of effectively brushing off dust attached toa surface to be cleaned such as a carpet. The rotation brush 8 is drivenby a brush motor (not shown) which is separate from a main motor (notshown) for rotating a suction fan in the cleaner body 3 and generatingsuction force for drawing-in the dirt.

Thus, user can control the rotation brush 8 not to rotate in a case ofcleaning a bare floor or to rotate in a case of cleaning a carpet byoperating a switch for turning on/off the brush motor.

However, there is a problem that cost for manufacturing the vacuumcleaner is increased as the vacuum cleaner with the above describedstructure is provided with the brush motor for driving the rotationbrush 8 besides the main motor for generating suction force.

In addition, there is another problem that structure of the cleaner bodyis complicated and size of the cleaner body is large as the main motorand the brush motor are installed in the cleaner body 3.

SUMMARY OF THE INVENTION

The present disclosure has been developed in order to overcome the abovedrawbacks and other problems associated with the conventionalarrangement. An aspect of the present disclosure is to provide arotation brush driving apparatus for a vacuum cleaner capable ofselectively rotating a rotation brush using power of a motor forgenerating suction force in a simple structure.

The above aspect and/or other feature of the present disclosure cansubstantially be achieved by providing a rotation brush drivingapparatus for a vacuum cleaner, which includes a motor for generatingsuction force; a rotation brush; a belt for transmitting rotation forceof the motor to the rotation brush; and a driving selection unitinstalled rotatably around a rotation shaft of the motor, forselectively transmitting the rotation force of the motor to the rotationbrush by selectively contacting the belt with the rotation shaft of themotor.

The driving selection unit includes a bar shaped selection linkinstalled rotatably around the rotation shaft of the motor; and an idlepulley installed rotatably at an end of the selection link andsupporting the belt; wherein the rotation shaft of the motor comes tocontact with the belt and thus the rotation force of the motor istransmitted to the rotation brush by pulling the selection link. Inaddition, the rotation shaft of the motor is separated from the belt andthus the rotation force of the motor is not transmitted to the rotationbrush by pushing the selection link in the opposite direction.

The driving selection unit may further include a fixing unit for fixingthe selection link to a predetermined position.

The fixing unit includes a fixing shaft having a front end formed toselectively project to a side surface of the selection link; a guidingholder for guiding the fixing shaft to move perpendicular to the sidesurface of the selection link and installed on the selection link sothat a rear end of the fixing shaft is projected; and an elastic memberinstalled inside the guiding member and elastically supporting thefixing shaft.

In addition, the rotation brush driving apparatus for a vacuum cleanermay further includes a link supporting shaft for supporting theselection link so as to rotate in relation to the rotation shaft of themotor.

The link supporting shaft is installed on a supporting bracket which isinstalled at a front of the motor.

The above aspect and/or other feature of the present disclosure can alsosubstantially be achieved by providing a rotation brush drivingapparatus for a vacuum cleaner, which includes a rotation brush providedwith a pulley; a belt installed to transmit force by contacting with thepulley of the rotation brush; a motor for generating suction forcehaving a rotation shaft which projects to a side; a link supportingshaft formed with a hole through which the rotation shaft of the motorpasses; a supporting bracket for supporting the link supporting shaftand installed at a side of the motor; and a driving selection unitinstalled rotatably on the link supporting shaft, for selectivelytransmitting the rotation force of the motor to the rotation brush byselectively contacting the belt with the rotation shaft of the motorthereby allowing the rotation brush to rotate.

The driving selection unit includes a bar shaped selection linkinstalled rotatably on the link supporting shaft; and an idle pulleyinstalled rotatably at an end of the selection link and supporting thebelt; wherein by the pulling the selection link in one direction, thebelt is moved by the idle pulley and thus the belt comes to contact withthe rotation shaft of the motor, the idle pulley and the pulley of therotation brush.

In addition, by the idle pulley by pushing the selection link in theopposite direction, the belt is moved and, thus, the belt comes tocontact with the idle pulley and the pulley of the rotation brush whileseparated from the rotation shaft of the motor.

Other objects, advantages and salient features of the disclosure willbecome apparent from the following detailed description, which, taken inconjunction with the annexed drawings, discloses preferred embodimentsof the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the disclosure will becomeapparent and more readily appreciated from the following description ofthe exemplary embodiments, taken in conjunction with the accompanyingdrawings of which:

FIG. 1 is a perspective view illustrating a conventional vacuum cleaner;

FIG. 2 is a perspective view illustrating a suction nozzle of a vacuumcleaner having a rotation brush driving apparatus according to anexemplary embodiment of the present disclosure;

FIG. 3 is an exploded perspective view illustrating the rotation brushdriving apparatus of the vacuum cleaner of FIG. 2;

FIG. 4 is a perspective view illustrating a selection link when force ofthe motor is transmitted to the rotation brush by the rotation brushdriving apparatus of the vacuum cleaner of FIG. 2;

FIG. 5 is a perspective view illustrating a selection link in a casethat the force of the motor is not transmitted to the rotation brush bythe rotation brush driving apparatus of the vacuum cleaner of FIG. 2;

FIG. 6A is a partial sectional view illustrating a state that a fixingunit is inserted into a fixing hole and thus the selection link is fixedin the rotation brush driving apparatus of the vacuum cleaner of FIG. 2;

FIG. 6B is a partial sectional view illustrating a state that the fixingunit is removed from the fixing hole and thus the selection link ismovable in the rotation brush driving apparatus of the vacuum cleaner ofFIG. 2.

Throughout the drawings, like reference numerals will be understood torefer to like parts, components and structures.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

Hereinafter, certain exemplary embodiments of the present disclosurewill be described in detail with reference to the accompanying drawings.

The matters defined in the description, such as a detailed constructionand elements thereof, are provided to assist in a comprehensiveunderstanding of the disclosure. Thus, it is apparent that the presentdisclosure may be carried out without those defined matters. Also,well-known functions or constructions are omitted to provide a clear andconcise description of exemplary embodiments of the present disclosure.

FIG. 2 illustrates a case that a rotation brush driving apparatus 100 ofa vacuum cleaner according to the present disclosure is installed in asuction nozzle 10 of an upright vacuum cleaner. FIG. 2 illustrates notcleaner body of the upright vacuum cleaner, but only the suction nozzle10. A structure of the cleaner body of the upright vacuum cleaner usingthe rotation brush driving apparatus 100 according to the presentdisclosure is similar to the conventional art and therefore will not bedescribed herein.

Referring to FIG. 2 to FIG. 4, the rotation brush driving apparatus 100of a vacuum cleaner according to the present disclosure includes a motor110, a rotation brush 120, a belt 130, and a driving selection unit 140.

The motor 110 is installed inside the cleaner body (not shown) of thevacuum cleaner and a rotation shaft 111 thereof is projected from a sidethereof. In addition, the motor 110 acts to generate suction force sothat the vacuum cleaner can draw-in dirt. In other words, the motor 110used in the rotation brush driving apparatus 100 of a vacuum cleaneraccording to the present disclosure is the same as the motor forgenerating the suction force in the vacuum cleaner. Thus, the rotationshaft 111 of the motor 110 also rotates when cleaning using the vacuumcleaner.

The rotation brush 120 is rotatably installed in the suction nozzle 10and a plurality of brushes 122 are formed helically on a cylindricalbody 121. A pulley 124 is formed at a side of the rotation brush 120.

The belt 130 is for transmitting rotation force of the motor 110 to therotation brush 120 and is installed between the pulley 124 of therotation brush 120 and an idle pulley 145 of the driving selection unit140 which will be described herein after.

The driving selection unit 140 is for transmitting the rotation force ofthe motor 110 to the rotation brush 120 selectively by user's operationand includes a selection link 141, the idle pulley 145, and a fixingunit 150.

The selection link 141 is installed rotatably around the rotation shaft111 of the motor 110 and formed in a bar shape in which two arms extendto both sides from a rotation center portion 141 a. A rotation hole 143through which the rotation shaft 111 of the motor 110 passes is formedat the rotation center portion 141 a of the selection link 141.

The selection link 141 is preferably supported by a link supportingshaft 160 so that the selection link 141 can rotate around a rotationcenter of the rotation shaft 111 of the motor 110 without interferencewith the rotation shaft 111 of the motor 110. The link supporting shaft160 is formed in a hollowed cylindrical shape and is inserted in therotation hole 143 of the selection link 141. The selection link 141 cantherefore rotate around the link supporting shaft 160. A link flange161, for fixing the link supporting shaft 160, is formed at an end ofthe link supporting shaft 160. The link flange 161 is formed with aplurality of fixing holes 161 a. The rotation shaft 111 passes throughan inner hole 163 of the link supporting shaft 160. The selection link141 can therefore rotate while sliding on an outer surface of the linksupporting shaft 160 without interference with the rotation shaft 111 ofthe motor 110.

Though the link supporting shaft 10 may be installed on the motor 110,in the present embodiment the link supporting shaft 10 is installed on aseparate supporting bracket 170. The supporting bracket 170 is installedat a front of the motor 110, that is, in a direction to which therotation shaft 111 of the motor 110 projects, and formed with a shafthole 171 through which the link supporting shaft 160 passes. The linksupporting shaft 160 is installed in the supporting bracket 170 using aplurality of bolts 164. For this end, a plurality of bolt holes 172 forfixing the link supporting shaft 160 is formed around the shaft hole 171of the supporting bracket 170.

The idle pulley 145 is rotatably installed at an end of the selectionlink 141 and supports the belt 130 so as to move the belt 130 accordingto the rotation of the selection link 141. The idle pulley 145 isrotatably installed on a pulley shaft 146 installed in a pulley hole 144formed in the end of the selection link 141. The idle pulley 145therefore rotates around the pulley shaft 146 together with the belt 130when the belt 130 rotates.

At this time, rotation centers of the rotation brush 120, the selectionlink 141 and idle pulley 145 are set to satisfy the following condition.That is, when the selection link 141 rotates by a predetermined angle ina first direction around the rotation shaft 111 of the motor 110, thebelt 130 is moved by the idle pulley 145 and thus the inner surface ofthe belt 130 is in contact with all of the rotation shaft 111 of themotor 110, the idle pulley 145 and the pulley 124 of the rotation brush124 and the belt 130 is applied with tension. If the belt 130 comes tocontact with all of the rotation shaft 111 of the motor 110, the idlepulley 145 and the pulley 124 of the rotation brush 124, the rotationforce of the motor 110 is transmitted through the belt 130 to therotation brush 120.

In addition, if the selection link 141 rotates by a predetermined anglein the opposite direction around the rotation shaft 111 of the motor110, the idle pulley 145 moves the belt 130 and thus the inner surfaceof the belt 130 is in contact with only the idle pulley 145 and thepulley 124 of the rotation brush 120 and is separated from the rotationshaft 111 of the motor 110. If the belt 130 is not in contact with therotation shaft 111 of the motor 110, the rotation force of the motor 110does not transmitted to the rotation brush 120.

For this end, in the present embodiment, the idle pulley 145, therotation shaft 111 of the motor 110 and the pulley 124 of the rotationbrush 120 are located substantially in a line so that the belt 130 isnot in contact with the rotation shaft 111 of the motor 110 in the casethat the rotation force is not transmitted, while in the case that therotation force is transmitted the idle pulley 145 is located below therotation shaft 111 of the motor 110 so that the rotation shaft 111 ofthe motor 110 is in contact with the inner surface of the belt 130.

In one embodiment, an end of the selection link 141 is formed as a handgrip 142 so that the user can easily rotate the selection link 141. Inaddition, in order to easily operate the selection link 141, it ispreferable that a length from the rotation center of the selection link141 to an end 142 a of the hand grip 142 is longer than a length fromthe rotation center of the selection link 141 to where the idle pulley145 is installed. Furthermore, it is preferable that an upper portion ofthe hand grip 142 is exposed to an upside of a cover 11 of the suctionnozzle 10 in which the rotation brush driving apparatus 100 isinstalled.

The fixing unit 150 is for fixing the selection link 141 to apredetermined position and includes a fixing shaft 151, a guiding holder153, and an elastic member 155.

The fixing shaft 151 is assembled inside of the guiding holder 153 andformed so that its front end 151 a is selectively projected or recessedfor a side surface of the selection link 141. A supporting sill 151 bfor supporting the elastic member 155 is formed on the fixing shaft 151.The projected front end 151 a of the fixing shaft 151 is inserted in oneof fixing holes 181 and 182 formed on the supporting bracket 170. Thetwo fixing holes 181 and 182 are formed on the supporting bracket 170.

The first fixing hole 181 is formed in a position at which the selectionlink 141 can be fixed so that the rotation force of the motor 110 istransmitted to the rotation brush 120 through the belt 130. In otherwords, when the selection link 141 is fixed to the first fixing hole181, the belt 130 comes to contact with the rotation shaft 111 of themotor 110 and thus the rotation force of the motor 110 is transmitted tothe rotation brush 120. The second fixing hole 182 is formed in aposition at which the selection link 141 can be fixed so that therotation force of the motor 110 is not transmitted to the rotation brush120. In other words, when the selection link 141 is fixed to the secondfixing hole 182, the belt 130 does not come to contact with the rotationshaft 111 of the motor 110 and thus the rotation force of the motor 110is not transmitted to the rotation brush 120.

In the present embodiment, the first fixing hole 181 and the secondfixing hole 182 form substantially a right angle on the shaft hole 171.In this case, the selection link 141 is a shape of a bar, which is benton the rotation hole 143. At this time, the degree that the selectionlink 141 is bent can be properly determined according to specificationsand arrangements of the idle pulley 145, the pulley 124 of the rotationbrush 120, and the rotation shaft 111 of the motor 110.

The guiding holder 153 is installed at a side surface of a side of theselection link 141 that the hand grip 142 is formed and guides so thatthe fixing shaft 151 can move perpendicularly to the side surface of theselection link 141. Thus, the guiding holder 153 is formed in a hollowedcylindrical shape and a holder flange 154 for fixing the guiding holder153 to the selection link 141 is formed at a front end of the guidingholder 153. At each of the holder flange 154 and the selection link 141are formed two bolt holes 154 a and 149 for fixing the guiding holder153 to the selection link 141. Between the two bolt holes 149 formed atthe selection link 141, a through hole 148 through which the front end151 a of the fixing shaft 151 passes is formed. In addition, a guidinghole 153 a through which a rear end 151 c of the fixing shaft 151 canproject is formed at a rear end f the guiding holder 153. A fixingbutton 157 may be installed at the rear end 151 c of the fixing shaft151 so that the user can easily pull the fixing shaft 151.

The elastic member 155 is installed inside the guiding holder 153 andelastically supports the fixing shaft 151. In other words, the elasticmember 155 is installed inside the guiding holder 153 with a state thatit is inserted on the rear end 151 c of the fixing shaft 151. Thus, whenthe user pulls the fixing shaft 151, which projects to a rear end of theguiding holder 153, the elastic member 155 is pressed by the supportingsill 151 b while the fixing shaft 151 moves rearward, and thus the frontend 151 a of the fixing shaft 151 is removed from the fixing holes 181and 182. When the fixing shaft 151 is released, the fixing shaft 151moves forward due to the restoring force of the elastic member 155 andthus the front end 151 a of the fixing shaft 151 is inserted into thefixing holes 181 and 182.

Operation of the rotation brush driving apparatus 100 of a vacuumcleaner according to the present disclosure with the above describedstructure will be described herein after with reference to FIG. 4 andFIG. 5.

The user check where the selection link 141 of the rotation brushdriving apparatus 100 is positioned in a case that the user intends tooperate the rotation brush 120 to clean a carpet. If the selection link141 is in a state of being fixed in the first fixing hole 181, the userperforms cleaning in the state. However, if the selection link 141 is ina state of being fixed in the second fixing hole 182, the user moves theselection link to fix it into the first fixing hole 181.

The fixing button 157 is firstly pulled in order to move the selectionlink 141. By pulling the fixing button 157, the fixing shaft 151 ismoved rearward in an inside of the guiding holder 153 and the front end151 a of the fixing shaft 151 is removed from the second fixing hole182, thereby resulting a state shown in FIG. 6B. In this state, the usergrips the hand grip 142 and rotates the selection link 141 toward thefirst fixing hole 181. When the selection link 141 is rotated by thepredetermined angle toward the first fixing hole 181 around the linksupporting shaft 160, the front end 151 a of the fixing shaft 151 comesto a position of the first fixing hole 181. In this position, the frontend 151 a of the fixing shaft 151 is automatically inserted into thefirst fixing hole 181 by the restoring force of the elastic member 155.FIG. 6A illustrates the state that the front end 151 a of the fixingshaft 151 is inserted in the first fixing hole 181. When the front end151 a of the fixing shaft 151 is inserted in the first fixing hole 181,the selection link 141 comes to a fixed state in which the selectionlink 141 is not rotated by the external force.

During the movement of the selection link 141 toward the first fixinghole 181, the idle pulley 145 is moved downward together with the belt130. When the selection link 141 is fixed into the first selection hole181, the idle pulley 145 is located below the rotation shaft 111 of themotor 110 and the rotation shaft 111 of the motor 110, which wasseparated from the belt 130, comes in to contact with the inner surfaceof the belt 130. In other words, the belt 130 is in contact with all ofthe pulley 124 of the rotation brush 120, the idle pulley 145 and therotation shaft 111 of the motor 110 and thus is applied with apredetermined tension. In this state, upon rotation of the rotationshaft 111 of the motor 110, the belt 130 is rotated by the rotationshaft 111 of the motor 110 and then the rotation brush 120 is rotated bythe belt 130. The rotation brush 120 therefore rotates in high speed toclean dirt on a surface to be cleaned such as a carpet.

The rotation brush 120 should not rotate in a case that the user intendsto clean a bare floor. That is, the selection link 141, which is fixedin the first fixing hole 181, should be moved and fixed to the secondfixing hole 182 when rotation of the rotation brush 120 is desired.

For this end, firstly, the selection link 141 is moved to the secondfixing hole 182 after the front end 151 a of the fixing shaft 151 isremoved from the first fixing hole 181 by pulling the fixing button 157.By rotating the selection link 141 by the predetermined angle, the frontend 151 a of the fixing shaft 151 is automatically inserted into thesecond fixing hole 182 and thus the selection kink 141 is fixed into thesecond fixing hole 182.

As the selection link 141 is rotated toward the second fixing hole 182,the idle pulley 145 is moved upward together with the belt 130. Afterthat, the selection link 141 is fixed in the second fixing hole 182 sothat the idle pulley 145 is located at a position in which the idlepulley 145 is approximately in a line together with the pulley 124 ofthe rotation brush 120 and the rotation shaft 111 of the motor 110. Inthis position, the inner surface of the belt 130 is not in contact withthe rotation shaft 111 of the motor 110. Thus, even if the rotationshaft 111 of the motor 110 rotates, the belt 130 does not rotate andthus the rotation brush 120 also does not rotate. In other words, therotation force of the motor 110 is not transmitted to the rotation brush120 even if the motor 110 operates for generating the suction force whenthe selection link 141 is fixed in the second fixing hole 182.

According to the rotation brush driving apparatus 100 of the presentdisclosure, the user can select two operation mode of the rotation brush120 by rotating the hand grip 142 by predetermined angle after pullingthe fixing button 157. In other words, the user may select a rotationmode in which force of the motor 110 is transmitted and thus therotation brush 120 rotates or select a stop mode in which force of themotor 110 is cut off and thus the rotation brush 120 does not rotate,only by using the hand grip 142 and the fixing button 157, if necessary.Thus, it is very simple and convenient for the user to transmit or cutoff the force of the motor 110 to the rotation brush 120.

The rotation brush driving apparatus 100 according to the presentdisclosure is applied to an upright vacuum cleaner in the abovedescription, however this does not limit the kind of the vacuum cleanerto which the present disclosure can be applied.

As described above, with rotation brush driving apparatus 100 accordingto the present disclosure, a separate motor for rotating the rotationbrush is not necessary as the rotation brush can be rotated using themotor for generating the suction force. Thus, the cost of materials canbe reduced.

In addition, rotation brush driving apparatus 100 according to thepresent disclosure has a simple structure as the force of the motor isselectively transmitted to the rotation brush using a single belt, apulley and a selection lever. Thus, it is easy to assemble and it ispossible to reduce the time taken to assemble.

While the exemplary embodiments of the present disclosure have beendescribed, additional variations and modifications of the exemplaryembodiments may occur to those skilled in the art once they learn of thebasic inventive concepts. Therefore, it is intended that the appendedclaims shall be construed to include both the above embodiments and allsuch variations and modifications that fall within the spirit and scopeof the disclosure.

1. A rotation brush driving apparatus for a vacuum cleaner, comprising:a motor for generating suction force; a rotation brush; a belt fortransmitting rotation force of the motor to the rotation brush; and adriving selection unit installed rotatably around a rotation shaft ofthe motor, for selectively transmitting the rotation force of the motorto the rotation brush by selectively contacting the belt with therotation shaft of the motor.
 2. The apparatus of claim 1, wherein thedriving selection unit comprises: a bar shaped selection link installedrotatably around the rotation shaft of the motor; and an idle pulleyinstalled rotatably at an end of the selection link and supporting thebelt, wherein the rotation shaft of the motor comes to contact with thebelt and thus the rotation force of the motor is transmitted to therotation brush by pulling the selection link.
 3. The apparatus of claim2, wherein the rotation shaft of the motor is separated from the beltand thus the rotation force of the motor is not transmitted to therotation brush by pushing the selection link in the opposite direction.4. The apparatus of claim 2, wherein the driving selection unit furthercomprises a fixing unit for fixing the selection link to a predeterminedposition.
 5. The apparatus of claim 4, wherein the fixing unit comprisesa fixing shaft having a front end formed to selectively project to aside surface of the selection link; a guiding holder for guiding thefixing shaft to move perpendicular to the side surface of the selectionlink and installed on the selection link so that a rear end of thefixing shaft is projected; and an elastic member installed inside theguiding member and elastically supporting the fixing shaft.
 6. Theapparatus of claim 2, further comprising a link supporting shaft forsupporting the selection link so as to rotate in relation to therotation shaft of the motor.
 7. The apparatus of claim 6, wherein thelink supporting shaft is installed on a supporting bracket which isinstalled at a front of the motor.
 8. A rotation brush driving apparatusfor a vacuum cleaner, comprising: a rotation brush provided with apulley; a belt installed to transmit force by contacting with the pulleyof the rotation brush; a motor for generating suction force having arotation shaft which projects to a side; a link supporting shaft formedwith a hole through which the rotation shaft of the motor passes; asupporting bracket for supporting the link supporting shaft andinstalled at the side of the motor; and a driving selection unitinstalled rotatably on the link supporting shaft, for selectivelytransmitting the rotation force of the motor to the rotation brush byselectively contacting the belt with the rotation shaft of the motorthereby allowing the rotation brush to rotate.
 9. The apparatus of claim8, wherein the driving selection unit comprises a bar shaped selectionlink installed rotatably on the link supporting shaft; and an idlepulley installed rotatably at an end of the selection link andsupporting the belt, wherein by the pulling the selection link in onedirection, the belt is moved by the idle pulley and thus the belt comesto contact with the rotation shaft of the motor, the idle pulley and thepulley of the rotation brush.
 10. The apparatus of claim 9, wherein bythe idle pulley by pushing the selection link in the opposite direction,the belt is moved and thus the belt comes to contact with the idlepulley and the pulley of the rotation brush while separated from therotation shaft of the motor.
 11. The apparatus of claim 9, wherein thedriving selection unit further comprises a fixing unit for fixing theselection link to a predetermined position.
 12. The apparatus of claim11, wherein the fixing unit comprises a fixing shaft having a front endformed to selectively project to a side surface of the selection link; aguiding holder for guiding the fixing shaft to move perpendicular to theside surface of the selection link and installed on the selection linkso that a rear end of the fixing shaft is projected; and an elasticmember installed inside the guiding member and elastically supportingthe fixing shaft.
 13. The apparatus of claim 12, wherein the supportingbracket comprises at least one fixing hole in which the supporting shaftof the fixing unit is inserted.